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Selection pressures

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Fill in the blanks to complete the three paragraphs on selection pressures.

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ecology
biodiversity
selection
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Belinda Schirmer
Belinda Schirmer
Australia

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Selection pressures

Fill in the blanks to complete the three paragraphs on selection pressures.

Belinda Schirmer
1

pressures source variation termites

Selection pressures are factors that alter biodiversity . Positive selection increase the liklihood of a particular species or a particular of a species surviving to reproduce . For example , an increased number of ants and in an ecosystem is a positive selection pressure for echidnas that use these as a food .

2

reproduce decrease corals fur

Negative selection pressures the likelihood of a particular species or a particular variation of a species surviving to . For example , an increase in average water temperatures decreases the liklihood of surviving . For example , an increase in average land temperatures selects variations of possums that can tolerate higher heats , perhaps by having less dense .

3

competition living

Selection pressures can be categorised as abiotic ( non - living ) or biotic ( ) . Examples of abiotic selection pressures include changes in gas availability , pH and access to sunlight . Examples of biotic selection pressures include presence of predators , diseases , and within a species .

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